Master Python Data Structures: Strings, Lists, Tuples, Dictionaries & Sets

1. Strings

Demonstrates common string operations in Python such as capitalize, count, center, endswith, isdigit, join, split, strip, and formatted output.

name = 'derek'
print(name.capitalize())          # Derek
print(name.count("e"))            # 2
print(name.center(10, '*'))       # ***derek***
print(name.endswith('k'))          # True
print('244'.isdigit())             # True
print('+'.join(['1', '2', '3']))   # 1+2+3
print('
123'.strip())            # 123
print("1+2+3+4".split('+'))      # ['1', '2', '3', '4']
msg = 'my name is {name} and i am {age} old'
print(msg.format(name='derek', age=20))  # my name is derek and i am 20 old

2. Lists

Shows list creation, slicing, appending, removing, popping, inserting, modifying, extending, counting, sorting, reversing, and enumerating elements.

fruit = ['apple', 'pear', 'grape', 'orange']
print(fruit[1])            # pear
print(fruit[1:3])          # ['pear', 'grape']
print(fruit[-1])           # orange
fruit.append('peach')
print(fruit)
fruit.remove('peach')
print(fruit)
fruit.pop()
print(fruit)
del fruit[2]
print(fruit)
fruit.insert(1, 'grape')
print(fruit)
fruit[2] = 'orange'
print(fruit)
fruit1 = ['apple', 'orange']
fruit2 = ['pear', 'grape']
fruit1.extend(fruit2)
print(fruit1)
print(fruit1.count('apple'))
fruit1.sort()
print(fruit1)
fruit1.reverse()
print(fruit1)
for index, item in enumerate(fruit1):
    print(index, item)

3. Tuples

Illustrates tuple creation and basic methods count and index.

fruit = ('apple', 'orange', 'grape')
print(fruit.count('apple'))   # 1
print(fruit.index('orange'))  # 1

4. Dictionaries

Shows dictionary creation, adding, modifying, deleting entries, retrieving values, and iterating over keys, values, and items.

fruit = {1: 'apple', 2: 'orange', 3: 'grape'}
print(fruit)
fruit[4] = 'pear'
print(fruit)
fruit[4] = 'peach'
print(fruit)
fruit.pop(4)
print(fruit)
print(fruit.get(1))
for k, v in fruit.items():
    print(k, v)
for k in fruit.keys():
    print(k)
for v in fruit.values():
    print(v)

5. Sets

Demonstrates set creation, adding single or multiple elements, removing, popping, and set operations such as union, difference, and intersection.

fruit = set(['apple', 'orange', 'pear'])
fruit.add('grape')
fruit.update(['peach', 'banana'])
fruit.remove('banana')
fruit.pop()
num1 = set([11, 22, 33, 44])
num2 = set([33, 44, 55, 66])
print(num1.union(num2))        # {66, 11, 22, 33, 44, 55}
print(num1.difference(num2))   # {11, 22}
print(num1.intersection(num2)) # {33, 44}